Star System Generated (Seed: 1766228020)
Star Details
Spectral Class: M3V
Temperature: 3,267 K
Mass: 0.31 sol
Luminosity: 0.02 lux
Habitable Zone (HZ)
Inner Boundary: 0.13 AU
Outer Boundary: 0.19 AU
Physical Limits
Snow Line: 0.68 AU
Max System Radius: 11.1 AU
Planetary System (6 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.6 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.01
Radius: 1.32
Gravity: 1.15 G
Time & Orbit
Eccentricity (e): 0.005
Orbit Range: 0.6 AU - 0.6 AU
Year: 305 Days
Day: 38.5 Hours
Environment
Temp: -123 °C
Axial Tilt: 36.1 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (2)
Outer Limit: 55,812,816 km
- M1: 348,713 km (0.069 R)
- M2: 423,512 km (0.116 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.58 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 459.8
Radius: 11.5
Gravity: 3.48 G
Time & Orbit
Eccentricity (e): 0.052
Orbit Range: 1.5 AU - 1.66 AU
Year: 1303 Days
Day: 9.9 Hours
Environment
Temp: -170 °C
Axial Tilt: 48.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (52)
Outer Limit: 55,812,816 km
- M1: 143,315 km (0.098 R)
- M2: 319,391 km (0.106 R)
- M3: 397,482 km (0.026 R)
- M4: 531,372 km (0.102 R)
- M5: 724,652 km (0.039 R)
- M6: 824,135 km (0.111 R)
- M7: 928,853 km (0.092 R)
- M8: 1,052,421 km (0.054 R)
- M9: 1,181,823 km (0.094 R)
- M10: 1,263,803 km (0.112 R)
- M11: 1,457,382 km (0.081 R)
- M12: 1,562,101 km (0.096 R)
- M13: 1,652,757 km (0.071 R)
- M14: 1,753,736 km (0.066 R)
- M15: 1,979,928 km (0.102 R)
- M16: 2,060,561 km (0.047 R)
- M17: 2,403,739 km (0.102 R)
- M18: 2,567,548 km (0.082 R)
- M19: 2,795,236 km (0.066 R)
- M20: 3,029,506 km (0.091 R)
- M21: 3,123,005 km (0.106 R)
- M22: 3,463,490 km (0.118 R)
- M23: 3,539,486 km (0.087 R)
- M24: 3,649,290 km (0.1 R)
- M25: 3,883,262 km (0.118 R)
- M26: 3,962,399 km (0.103 R)
- M27: 4,237,958 km (0.1 R)
- M28: 4,389,800 km (0.033 R)
- M29: 4,555,405 km (0.057 R)
- M30: 5,064,636 km (0.111 R)
- M31: 5,138,986 km (0.035 R)
- M32: 5,313,567 km (0.036 R)
- M33: 5,477,676 km (0.058 R)
- M34: 5,862,591 km (0.053 R)
- M35: 6,019,070 km (0.045 R)
- M36: 6,137,253 km (0.101 R)
- M37: 6,309,440 km (0.12 R)
- M38: 6,658,751 km (0.085 R)
- M39: 6,808,349 km (0.1 R)
- M40: 6,973,056 km (0.105 R)
- M41: 7,138,960 km (0.1 R)
- M42: 7,292,148 km (0.117 R)
- M43: 7,729,872 km (0.097 R)
- M44: 8,118,228 km (0.109 R)
- M45: 8,219,954 km (0.058 R)
- M46: 8,424,604 km (0.097 R)
- M47: 8,498,206 km (0.118 R)
- M48: 9,079,095 km (0.057 R)
- M49: 9,169,601 km (0.115 R)
- M50: 9,260,407 km (0.115 R)
- M51: 10,483,968 km (0.063 R)
- M52: 10,642,542 km (0.047 R)
Planet 3 - Ice Giant
Semi-Major Axis: 7.99 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 397.6
Radius: 6.9
Gravity: 8.35 G
Time & Orbit
Eccentricity (e): 0.124
Orbit Range: 7 AU - 8.98 AU
Year: 14816 Days
Day: 23.1 Hours
Environment
Temp: -232 °C
Axial Tilt: 48.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (91)
Outer Limit: 55,812,816 km
- M1: 94,396 km (0.119 R)
- M2: 171,738 km (0.09 R)
- M3: 500,854 km (0.114 R)
- M4: 564,582 km (0.117 R)
- M5: 848,220 km (0.106 R)
- M6: 925,712 km (0.115 R)
- M7: 1,046,587 km (0.109 R)
- M8: 1,108,969 km (0.117 R)
- M9: 1,371,513 km (0.108 R)
- M10: 1,775,876 km (0.061 R)
- M11: 1,952,701 km (0.041 R)
- M12: 2,242,322 km (0.028 R)
- M13: 2,630,529 km (0.09 R)
- M14: 2,832,486 km (0.062 R)
- M15: 3,039,530 km (0.057 R)
- M16: 3,160,105 km (0.045 R)
- M17: 3,499,842 km (0.093 R)
- M18: 3,690,131 km (0.069 R)
- M19: 3,981,847 km (0.074 R)
- M20: 4,180,363 km (0.115 R)
- M21: 4,247,383 km (0.116 R)
- M22: 4,484,495 km (0.073 R)
- M23: 5,659,587 km (0.056 R)
- M24: 5,920,485 km (0.102 R)
- M25: 6,570,638 km (0.1 R)
- M26: 6,766,162 km (0.103 R)
- M27: 9,040,050 km (0.099 R)
- M28: 9,520,857 km (0.112 R)
- M29: 9,564,989 km (0.082 R)
- M30: 10,235,038 km (0.05 R)
- M31: 10,325,544 km (0.062 R)
- M32: 10,370,872 km (0.069 R)
- M33: 10,461,678 km (0.12 R)
- M34: 10,644,337 km (0.115 R)
- M35: 12,672,436 km (0.065 R)
- M36: 13,308,675 km (0.107 R)
- M37: 14,055,618 km (0.108 R)
- M38: 14,105,882 km (0.109 R)
- M39: 14,611,972 km (0.12 R)
- M40: 15,175,657 km (0.065 R)
- M41: 15,330,640 km (0.081 R)
- M42: 16,113,187 km (0.071 R)
- M43: 19,259,230 km (0.083 R)
- M44: 19,370,979 km (0.099 R)
- M45: 21,073,702 km (0.05 R)
- M46: 21,768,136 km (0.032 R)
- M47: 22,059,702 km (0.06 R)
- M48: 22,118,045 km (0.082 R)
- M49: 23,536,682 km (0.076 R)
- M50: 23,836,027 km (0.086 R)
- M51: 24,377,871 km (0.072 R)
- M52: 25,045,526 km (0.061 R)
- M53: 25,106,562 km (0.073 R)
- M54: 25,842,434 km (0.108 R)
- M55: 26,461,021 km (0.109 R)
- M56: 26,772,185 km (0.106 R)
- M57: 27,272,589 km (0.077 R)
- M58: 27,649,875 km (0.119 R)
- M59: 28,155,666 km (0.114 R)
- M60: 28,282,525 km (0.098 R)
- M61: 29,949,643 km (0.089 R)
- M62: 31,978,789 km (0.107 R)
- M63: 32,976,457 km (0.088 R)
- M64: 33,849,361 km (0.116 R)
- M65: 33,984,298 km (0.113 R)
- M66: 34,254,771 km (0.037 R)
- M67: 35,206,961 km (0.081 R)
- M68: 35,823,753 km (0.036 R)
- M69: 36,928,982 km (0.106 R)
- M70: 37,835,246 km (0.112 R)
- M71: 38,537,309 km (0.094 R)
- M72: 38,889,911 km (0.097 R)
- M73: 39,243,710 km (0.118 R)
- M74: 39,669,615 km (0.12 R)
- M75: 40,884,500 km (0.113 R)
- M76: 41,604,963 km (0.107 R)
- M77: 42,329,466 km (0.108 R)
- M78: 43,350,920 km (0.062 R)
- M79: 43,497,526 km (0.072 R)
- M80: 44,159,197 km (0.057 R)
- M81: 44,676,058 km (0.032 R)
- M82: 45,418,063 km (0.11 R)
- M83: 45,790,412 km (0.066 R)
- M84: 46,538,551 km (0.114 R)
- M85: 47,592,468 km (0.108 R)
- M86: 48,198,340 km (0.085 R)
- M87: 48,426,177 km (0.111 R)
- M88: 48,654,314 km (0.113 R)
- M89: 48,882,899 km (0.12 R)
- M90: 50,801,492 km (0.094 R)
- M91: 51,886,525 km (0.115 R)
Planet 4 - Ice Giant
Semi-Major Axis: 9.19 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 645.6
Radius: 7.5
Gravity: 11.48 G
Time & Orbit
Eccentricity (e): 0.186
Orbit Range: 7.48 AU - 10.9 AU
Year: 18276 Days
Day: 16 Hours
Environment
Temp: -238 °C
Axial Tilt: 27.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (91)
Outer Limit: 55,812,816 km
- M1: 95,443 km (0.111 R)
- M2: 153,188 km (0.094 R)
- M3: 697,126 km (0.069 R)
- M4: 1,770,790 km (0.052 R)
- M5: 1,987,557 km (0.101 R)
- M6: 2,115,164 km (0.105 R)
- M7: 2,180,090 km (0.096 R)
- M8: 2,378,756 km (0.104 R)
- M9: 2,548,849 km (0.098 R)
- M10: 3,306,113 km (0.098 R)
- M11: 3,534,549 km (0.042 R)
- M12: 4,838,145 km (0.12 R)
- M13: 6,088,035 km (0.077 R)
- M14: 7,038,580 km (0.091 R)
- M15: 7,831,897 km (0.116 R)
- M16: 8,757,908 km (0.04 R)
- M17: 10,376,707 km (0.084 R)
- M18: 12,496,509 km (0.039 R)
- M19: 13,453,486 km (0.116 R)
- M20: 13,514,073 km (0.091 R)
- M21: 15,691,321 km (0.067 R)
- M22: 15,755,049 km (0.049 R)
- M23: 16,268,469 km (0.103 R)
- M24: 17,974,932 km (0.102 R)
- M25: 19,325,801 km (0.098 R)
- M26: 19,806,309 km (0.108 R)
- M27: 21,271,471 km (0.052 R)
- M28: 21,342,081 km (0.088 R)
- M29: 21,412,691 km (0.098 R)
- M30: 21,981,313 km (0.104 R)
- M31: 22,410,958 km (0.109 R)
- M32: 23,060,512 km (0.099 R)
- M33: 24,009,860 km (0.099 R)
- M34: 24,157,064 km (0.073 R)
- M35: 24,230,666 km (0.097 R)
- M36: 26,021,951 km (0.108 R)
- M37: 26,248,891 km (0.09 R)
- M38: 27,316,272 km (0.104 R)
- M39: 27,469,909 km (0.072 R)
- M40: 27,546,952 km (0.114 R)
- M41: 27,932,615 km (0.056 R)
- M42: 29,257,604 km (0.072 R)
- M43: 29,651,196 km (0.062 R)
- M44: 30,205,156 km (0.114 R)
- M45: 31,806,602 km (0.043 R)
- M46: 31,887,385 km (0.07 R)
- M47: 32,130,182 km (0.107 R)
- M48: 34,841,344 km (0.055 R)
- M49: 35,509,598 km (0.106 R)
- M50: 36,097,667 km (0.058 R)
- M51: 36,182,040 km (0.088 R)
- M52: 37,368,950 km (0.09 R)
- M53: 37,624,912 km (0.097 R)
- M54: 38,482,407 km (0.03 R)
- M55: 39,000,015 km (0.109 R)
- M56: 39,780,767 km (0.093 R)
- M57: 40,829,747 km (0.081 R)
- M58: 41,357,678 km (0.088 R)
- M59: 42,331,261 km (0.044 R)
- M60: 43,402,082 km (0.112 R)
- M61: 44,120,900 km (0.111 R)
- M62: 45,570,354 km (0.12 R)
- M63: 45,752,564 km (0.116 R)
- M64: 46,209,286 km (0.115 R)
- M65: 46,667,505 km (0.097 R)
- M66: 47,035,216 km (0.114 R)
- M67: 47,219,521 km (0.095 R)
- M68: 47,958,684 km (0.105 R)
- M69: 48,051,285 km (0.089 R)
- M70: 49,729,623 km (0.103 R)
- M71: 50,011,167 km (0.116 R)
- M72: 50,953,633 km (0.108 R)
- M73: 51,616,801 km (0.104 R)
- M74: 55,363,629 km (0.101 R)
- M75: 56,143,034 km (0.093 R)
- M76: 56,436,246 km (0.093 R)
- M77: 57,122,301 km (0.117 R)
- M78: 57,614,179 km (0.086 R)
- M79: 57,811,200 km (0.07 R)
- M80: 58,998,558 km (0.099 R)
- M81: 60,193,845 km (0.08 R)
- M82: 60,293,926 km (0.102 R)
- M83: 61,296,680 km (0.104 R)
- M84: 63,115,491 km (0.05 R)
- M85: 66,599,177 km (0.092 R)
- M86: 67,427,949 km (0.058 R)
- M87: 67,635,591 km (0.045 R)
- M88: 68,468,552 km (0.111 R)
- M89: 68,677,390 km (0.058 R)
- M90: 69,724,426 km (0.102 R)
- M91: 70,144,796 km (0.082 R)
Planet 5 - Ice Giant
Semi-Major Axis: 9.39 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 744.7
Radius: 3.7
Gravity: 54.4 G
Time & Orbit
Eccentricity (e): 0.047
Orbit Range: 8.95 AU - 9.83 AU
Year: 18876 Days
Day: 24.2 Hours
Environment
Temp: -228 °C
Axial Tilt: 6.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (96)
Outer Limit: 55,812,816 km
- M1: 72,555 km (0.083 R)
- M2: 379,829 km (0.069 R)
- M3: 716,873 km (0.081 R)
- M4: 740,360 km (0.107 R)
- M5: 788,231 km (0.06 R)
- M6: 887,115 km (0.109 R)
- M7: 990,039 km (0.108 R)
- M8: 1,321,697 km (0.06 R)
- M9: 1,716,486 km (0.106 R)
- M10: 1,877,603 km (0.091 R)
- M11: 2,460,885 km (0.098 R)
- M12: 2,642,347 km (0.07 R)
- M13: 2,679,148 km (0.09 R)
- M14: 2,941,693 km (0.09 R)
- M15: 3,173,420 km (0.117 R)
- M16: 3,251,809 km (0.083 R)
- M17: 3,819,234 km (0.089 R)
- M18: 3,986,933 km (0.09 R)
- M19: 4,770,826 km (0.038 R)
- M20: 4,906,062 km (0.093 R)
- M21: 5,506,398 km (0.025 R)
- M22: 5,600,795 km (0.096 R)
- M23: 6,178,542 km (0.097 R)
- M24: 6,524,262 km (0.101 R)
- M25: 7,131,330 km (0.106 R)
- M26: 8,075,293 km (0.093 R)
- M27: 8,182,555 km (0.042 R)
- M28: 8,236,410 km (0.086 R)
- M29: 8,561,785 km (0.117 R)
- M30: 9,225,252 km (0.098 R)
- M31: 9,281,201 km (0.099 R)
- M32: 9,563,044 km (0.076 R)
- M33: 10,077,511 km (0.072 R)
- M34: 10,600,804 km (0.037 R)
- M35: 11,734,307 km (0.091 R)
- M36: 11,977,853 km (0.114 R)
- M37: 12,593,747 km (0.098 R)
- M38: 13,536,962 km (0.113 R)
- M39: 16,093,440 km (0.086 R)
- M40: 16,840,831 km (0.027 R)
- M41: 17,253,272 km (0.045 R)
- M42: 18,158,190 km (0.069 R)
- M43: 18,651,713 km (0.08 R)
- M44: 19,078,366 km (0.12 R)
- M45: 21,630,207 km (0.118 R)
- M46: 22,303,547 km (0.094 R)
- M47: 24,364,407 km (0.04 R)
- M48: 24,519,390 km (0.102 R)
- M49: 24,908,494 km (0.088 R)
- M50: 25,221,303 km (0.099 R)
- M51: 26,008,787 km (0.109 R)
- M52: 27,044,602 km (0.043 R)
- M53: 29,156,176 km (0.03 R)
- M54: 30,648,864 km (0.068 R)
- M55: 30,816,264 km (0.11 R)
- M56: 31,742,275 km (0.107 R)
- M57: 32,166,235 km (0.07 R)
- M58: 32,848,401 km (0.096 R)
- M59: 33,535,355 km (0.111 R)
- M60: 35,800,416 km (0.047 R)
- M61: 35,888,529 km (0.048 R)
- M62: 36,684,689 km (0.106 R)
- M63: 38,294,362 km (0.086 R)
- M64: 38,384,420 km (0.101 R)
- M65: 40,109,732 km (0.085 R)
- M66: 42,045,828 km (0.048 R)
- M67: 44,201,084 km (0.074 R)
- M68: 44,674,263 km (0.1 R)
- M69: 44,769,108 km (0.105 R)
- M70: 44,959,097 km (0.119 R)
- M71: 45,817,041 km (0.075 R)
- M72: 46,200,011 km (0.102 R)
- M73: 49,694,617 km (0.102 R)
- M74: 51,076,453 km (0.119 R)
- M75: 55,195,182 km (0.047 R)
- M76: 55,602,686 km (0.089 R)
- M77: 57,036,881 km (0.11 R)
- M78: 57,551,946 km (0.105 R)
- M79: 57,758,391 km (0.047 R)
- M80: 58,483,044 km (0.115 R)
- M81: 58,690,685 km (0.114 R)
- M82: 59,941,324 km (0.039 R)
- M83: 61,095,471 km (0.082 R)
- M84: 62,681,209 km (0.073 R)
- M85: 63,000,002 km (0.074 R)
- M86: 64,173,298 km (0.095 R)
- M87: 64,601,746 km (0.102 R)
- M88: 66,108,945 km (0.066 R)
- M89: 66,649,891 km (0.103 R)
- M90: 67,627,513 km (0.109 R)
- M91: 68,281,854 km (0.074 R)
- M92: 70,037,086 km (0.071 R)
- M93: 70,920,311 km (0.118 R)
- M94: 71,030,864 km (0.109 R)
- M95: 72,697,684 km (0.109 R)
- M96: 72,809,134 km (0.06 R)
Planet 6 - Ice Giant
Semi-Major Axis: 10.21 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 236.1
Radius: 3.3
Gravity: 21.68 G
Time & Orbit
Eccentricity (e): 0.038
Orbit Range: 9.82 AU - 10.6 AU
Year: 21402 Days
Day: 22 Hours
Environment
Temp: -221 °C
Axial Tilt: 6.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (94)
Outer Limit: 55,812,816 km
- M1: 42,785 km (0.106 R)
- M2: 105,317 km (0.095 R)
- M3: 198,816 km (0.056 R)
- M4: 487,240 km (0.064 R)
- M5: 573,409 km (0.115 R)
- M6: 1,302,997 km (0.098 R)
- M7: 1,571,974 km (0.096 R)
- M8: 1,674,150 km (0.059 R)
- M9: 1,965,716 km (0.082 R)
- M10: 2,655,213 km (0.11 R)
- M11: 2,900,104 km (0.099 R)
- M12: 3,677,564 km (0.099 R)
- M13: 4,054,102 km (0.118 R)
- M14: 4,587,269 km (0.098 R)
- M15: 6,557,473 km (0.069 R)
- M16: 7,435,014 km (0.107 R)
- M17: 7,477,650 km (0.113 R)
- M18: 7,563,369 km (0.079 R)
- M19: 9,435,287 km (0.118 R)
- M20: 9,807,337 km (0.072 R)
- M21: 10,136,752 km (0.105 R)
- M22: 10,517,777 km (0.08 R)
- M23: 10,710,011 km (0.086 R)
- M24: 10,903,441 km (0.063 R)
- M25: 11,049,149 km (0.038 R)
- M26: 11,937,461 km (0.097 R)
- M27: 12,137,922 km (0.12 R)
- M28: 12,390,144 km (0.08 R)
- M29: 13,468,147 km (0.106 R)
- M30: 13,676,836 km (0.118 R)
- M31: 13,939,230 km (0.115 R)
- M32: 14,415,700 km (0.11 R)
- M33: 15,931,874 km (0.081 R)
- M34: 16,596,986 km (0.094 R)
- M35: 16,764,685 km (0.109 R)
- M36: 18,472,345 km (0.088 R)
- M37: 18,646,178 km (0.073 R)
- M38: 19,170,818 km (0.05 R)
- M39: 19,229,310 km (0.11 R)
- M40: 19,287,953 km (0.083 R)
- M41: 19,464,329 km (0.097 R)
- M42: 20,055,839 km (0.045 R)
- M43: 20,294,148 km (0.041 R)
- M44: 20,413,677 km (0.049 R)
- M45: 21,438,721 km (0.074 R)
- M46: 21,743,303 km (0.09 R)
- M47: 22,665,873 km (0.066 R)
- M48: 22,851,972 km (0.117 R)
- M49: 23,225,518 km (0.061 R)
- M50: 23,475,646 km (0.116 R)
- M51: 24,358,423 km (0.106 R)
- M52: 24,740,047 km (0.09 R)
- M53: 24,995,560 km (0.058 R)
- M54: 25,380,476 km (0.106 R)
- M55: 25,509,130 km (0.112 R)
- M56: 26,286,141 km (0.101 R)
- M57: 28,663,102 km (0.101 R)
- M58: 29,065,969 km (0.082 R)
- M59: 29,268,075 km (0.11 R)
- M60: 30,081,140 km (0.115 R)
- M61: 30,970,350 km (0.098 R)
- M62: 31,245,610 km (0.075 R)
- M63: 31,452,653 km (0.063 R)
- M64: 32,076,476 km (0.102 R)
- M65: 32,146,039 km (0.108 R)
- M66: 33,125,307 km (0.082 R)
- M67: 33,477,460 km (0.099 R)
- M68: 33,759,901 km (0.067 R)
- M69: 34,043,239 km (0.084 R)
- M70: 34,898,042 km (0.032 R)
- M71: 35,328,136 km (0.11 R)
- M72: 35,399,943 km (0.095 R)
- M73: 35,831,981 km (0.03 R)
- M74: 36,919,857 km (0.104 R)
- M75: 37,211,722 km (0.1 R)
- M76: 37,504,485 km (0.061 R)
- M77: 38,756,919 km (0.07 R)
- M78: 40,623,451 km (0.113 R)
- M79: 41,378,173 km (0.045 R)
- M80: 43,131,609 km (0.111 R)
- M81: 43,208,503 km (0.086 R)
- M82: 43,747,205 km (0.115 R)
- M83: 44,987,072 km (0.105 R)
- M84: 46,474,374 km (0.108 R)
- M85: 46,710,589 km (0.11 R)
- M86: 46,868,414 km (0.053 R)
- M87: 47,977,683 km (0.102 R)
- M88: 49,416,515 km (0.113 R)
- M89: 49,577,183 km (0.119 R)
- M90: 49,818,634 km (0.096 R)
- M91: 50,060,534 km (0.052 R)
- M92: 52,746,264 km (0.11 R)
- M93: 54,479,655 km (0.068 R)
- M94: 55,061,591 km (0.088 R)
Kuiper Belt
Range: 30 - 58 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 390 - 10,709 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.